iOS 8.1 iPhone 5s nex 8000 latest firmware on both
I spent about 3 hours playing with it, I have no issues, I can control spotify from the head unit, RDIO and do all the other functions, Siri, maps, etc. it all works fine for me.
I didn't make a call so ill check that later to see if call quality is improved or not.
On a side note, not CarPlay related, but aha just sounds like shit.